Abstract
Filtering capacitor is a necessary component in the modern electronic circuit. Traditional filtering capacitor is often limited by its bulky and rigid configuration and narrow workable scope of applications. Here, an aqueous hybrid electrochemical capacitor is developed for alternating current line filtering with an applicable wide frequency range from 1 to 10,000 Hz. This capacitor possesses an areal specific energy density of 438 μF V2 cm−2 at 120 Hz, which to the best of our knowledge is record high among aqueous electrochemical capacitors reported so far. It can convert arbitrary alternating current waveforms and even noises to straight signals. After integration of capacitor units, a workable voltage up to hundreds of volts (e.g., 200 V) could be achieved without sacrificing its filtering capability. The integrated features of wide frequency range and high workable voltage for this capacitor present promise for multi-scenario and applicable filtering capacitors of practical importance.
Highlights
Filtering capacitor is a necessary component in the modern electronic circuit
After dissolution of cellulose membrane by concentrated sulfuric acid, a hierarchically porous PEDOT network was adhered on a graphite foil which acts as the current collector (Fig. 1b–d and Supplementary Fig. 3)
The as-prepared hierarchically porous structure and highly conductive skeleton endow the positive electrode and negative electrode with the quick electrons transport and abundant charge adsorption sites, which are essential for the high-frequency responsive electrochemical process[22]
Summary
Filtering capacitor is a necessary component in the modern electronic circuit. Traditional filtering capacitor is often limited by its bulky and rigid configuration and narrow workable scope of applications. One AHEC unit is composed of a positive electrode of acid-pretreated poly(3,4-ethylenedioxythiophene) (PEDOT) film, a negative electrode of electrochemically reduced graphene oxide (ErGO) sheets, and aqueous electrolyte In this EC, both the stable electrode materials have high conductivities and large porous structures, being in favor of quick electron transport and good electric double-layer capacitive behaviors. The large specific energy density and low total impedance of this AHEC enables the efficient smoothing of AC into DC within a wide frequency range from 1 Hz to 10,000 Hz. the rational integration of AHEC units in series allows the device filtering more than hundreds of volts without sacrificing the rate performance and frequency-response properties. The connected AHEC units can smooth arbitrary AC waveforms (e.g., decaying, stair, electrocardiogram, rhombus, ellipse, heart, and violent noise waveforms.) into DC signals, indicative of diversified adaptability and good filtering capability for future practical filtering capacitors
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